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Please make a list of your observable traits. Be specific.

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Presentation on theme: "Please make a list of your observable traits. Be specific."— Presentation transcript:

1 Please make a list of your observable traits. Be specific.
SPONGE 9 Please make a list of your observable traits. Be specific.

2 Blonde Hair Fine hair (texture) Wavy hair Blue-green eyes Medium length eye-lashes Oval shaped face Light peach skin 5’6 Detached earlobes Non-hitch hikers thumb Rolled tongue

3 7.1 Chromosomes and Phenotype
Set up Cornell Notes on pg. 89 Topic: 7.1 Chromosomes and Phenotype Essential Questions: Don’t forget to add it to your T.O.Contents! 7.1 Chromosomes and Phenotype 2.1 Atoms, Ions, and Molecules

4 KEY CONCEPT The chromosomes on which genes are located can affect the expression of traits.

5 Sexually reproducing organisms have two of each chromosome.
One from mother and one from father Have the same genes, but may have different alleles About 99.9% of all human DNA is identical

6 Autosomal genetic disorders: disorders that have no relation to the sex of an individual
Autosomal recessive disorder: Any offspring with two recessive genes (cc) will have the disease/disorder A carrier is heterozygous (Cc) for a recessive disorder C c CC Cc Ex: Cystic Fibrosis C *carrier c Cc cc *carrier Disorder

7 Albinism is a autosomal recessive disorder characterized by a lack of pigment I skin, hair and eyes.

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11 A a A a A a Fill out these punnett sqs. What is the probability that the offspring will have albinism?

12 A a A a A a AA Aa Aa aa AA Aa Aa aa O% will have albinism 50% carriers
Both Mom and Dad have to either have the disorder or be carriers for offspring to be affected with an autosomal recessive disorder!

13 Autosomal Dominant Disorders: any offspring showing a dominant allele will have the disorder
Dominant disorders are uncommon Ex: Huntington’s Disease H h Hh hh h *anywhere there is an H the child will have the disease Disorder Hh hh h Disorder

14 Genes on sex chromosomes are called sex-linked genes.
Y chromosome genes in mammals are responsible for male characteristics. X chromosome genes in mammals affect many traits.

15 Male mammals have an XY genotype.
All of a male’s sex-linked genes are expressed because Males have no second copies of sex-linked genes. One copy X, one copy Y

16 Female mammals have an XX genotype.
Expression of sex-linked genes is similar to autosomal genes in females. X chromosome inactivation randomly “turns off” one X chromosome ensures that females, like males, have one functional copy of the X chromosome in each body cell X

17 Males only have one X chromosome so one color will be present (recessive OR dominant)
Female cats have two X chromosomes. Each patch of fur can be different depending on which X chromosome “turns off”

18 Pg. 65-66 All Autosomal Recessive: DD- no disorder Dd-carrier
dd- disorder Autosomal Dominant: DD- disorder Dd-disorder dd-no disorder


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